Well, I think that the advice about CR in my long, long rant (from 2012!) probably still very much applies to you, iMyself. If your memory is truly bad when you're reading, then I suppose you have to at least try to take notes, and see if it helps.
For CR, I think the key is to think about the logical structure of the argument. If the passage has a conclusion, start there -- write down the conclusion exactly as it's stated in the passage, and then see if you can figure out how, exactly, everything else in the passage supports that conclusion. If you're doing a "resolve the paradox/discrepancy" question, try writing down exactly what the paradox is -- again, exactly as it's stated in the passage. If you start to let the language drift away from the passage, then you risk making some pretty serious errors.
But again: everybody is different. Some people like to turn their CR into pictures and flow charts (Mike, a.k.a. GMATNinjaTwo, tends to prefer this approach when he takes the exam). Some people disengage as soon as they start taking any sort of notes. I tend to turn my CR notes into lists that look something like this:
Conclusion: blah blah
Why?
- blah blah burrito blah blah
- blah blah
- and another thing: blah
But that's just me; I don't do well with pictures. GMATNinjaTwo does. Different strokes for different folks.
For RC, I'd make a similar case: there are some important fundamentals, but everybody is different. The simplest approach is to stop at the end of every paragraph, and ask yourself: why is this paragraph here? What is its purpose? How does it connect to the earlier paragraphs, and what is the author trying to accomplish with it? Most of our students improve once they learn to completely engage in those questions -- and most will write down no more than 8-12 words for each paragraph, just to keep themselves on track.
But again: some will be better off taking ZERO notes. Some need to keep their hand moving constantly in order to stay engaged. Both of those things are fine -- and as long as you stay focused on the big picture and avoid obsessing over little details on RC, you'll be OK. It's just a question of figuring out what type of notes work for you personally.
So the key is always to be really conscious, critical, and thoughtful about what you're doing. If you let your brain go into auto-pilot -- or worse, if you decide to blindly follow a note-taking strategy from some test-prep company -- then you'll be missing the point. The key is to figure out the type of note-taking that helps YOU engage fully in the passage, on both CR and RC. And since we're all different, your optimal note-taking strategy is going to be different from that of the guy sitting next to you at HBS.
I hope this helps!